/**
   * drop an item at a powerup spawn point
   *
   * @param item the item to drop
   */
  protected void dropItemOnSpawn(Material item) {
    debug.i("calculating item spawn location");
    Location aim = SpawnManager.getCoords(arena, "powerup").add(0, 1, 0).toLocation();

    debug.i("dropping item on spawn: " + aim.toString());
    Bukkit.getWorld(arena.getWorld()).dropItem(aim, new ItemStack(item, 1));
  }